HP dx2420 - Microtower PC Service & Reference Manual page 44

Figure 6-10
Table 6-1 DIMM Socket Locations
Item
1
2
NOTE: A DIMM must occupy the DIMM1 socket.
The system will automatically operate in single channel mode, dual channel mode, or flex mode,
depending on how the DIMMs are installed.
●
The system will operate in single channel mode if the DIMM sockets are populated in one channel
only.
●
The system will operate in a higher-performing dual channel mode if the memory capacity of the
DIMM in Channel A is equal to the total memory capacity of the DIMM in Channel B.
●
The system will operate in flex mode if the memory capacity of the DIMM in Channel A is not equal
to the memory capacity of the DIMM in Channel B. In flex mode, the channel populated with the
least amount of memory describes the total amount of memory assigned to dual channel and the
remainder is assigned to single channel. If one channel will have more memory than the other, the
larger amount should be assigned to Channel A.
●
In any mode, the maximum operational speed is determined by the slowest DIMM in the system.
38 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis
DIMM Socket Locations
Description
DIMM1 socket, Channel A (populate first)
DIMM2 socket, Channel B
Socket Color
Blue
Blue